Underlying Index Performance: The price of UDEF.TO is heavily influenced by the performance of the underlying index it tracks. Positive index returns typically lead to ETF price increases, while negative returns cause price decreases.

Supply and Demand: Like any security, UDEF.TO's price is determined by the forces of supply and demand in the market. Higher demand tends to push the price up, while increased selling pressure can lead to price declines.

Currency Fluctuations: As UDEF.TO invests in global equities, currency fluctuations between the Canadian dollar and the currencies of the underlying investments can impact the ETF's value. A stronger Canadian dollar may negatively affect returns.

Interest Rates: Changes in interest rates can affect the valuations of the underlying assets in UDEF.TO's portfolio, and broader market sentiment, influencing ETF price.

Economic Conditions: Overall economic health, including factors like GDP growth, inflation, and unemployment, can affect investor sentiment and corporate earnings, ultimately influencing UDEF.TO's price.

Global Events: Geopolitical events, regulatory changes, and other global occurrences can introduce volatility and impact investor confidence, affecting UDEF.TO's price.

ETF Trading Dynamics: Arbitrage opportunities and the ETF creation/redemption mechanism can also influence the ETF's price, keeping it closely aligned with its net asset value (NAV).